[BUGFIX] Add missing frontend context check when fetching view configuration

Check for Frontend context has been omitted during refactoring and will
have side effects in Backend in view configuration is overridden in
Frontend context.

Change-Id: I752baed15f0be6be59fcc37f12103f0a70caa427
Resolves: #81677
Related: #81340
Releases: master, 8.7
Reviewed-on: https://review.typo3.org/53309


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Alexander Grein <alexander.grein@gmail.com>
Tested-by: Alexander Grein <alexander.grein@gmail.com>
Reviewed-by: Markus Klein <markus.klein@typo3.org>
Tested-by: Markus Klein <markus.klein@typo3.org>